An artist and a gallery curator wished to expand their living space in anticipation of their first child. Existing site conditions, the potential for a sweeping bay view, and a tight budget produced a distinct 'tower' addition at the rear yard. Housing a bedroom, den, and study, the structure comprises a spare palette of concrete and cork floors, white walls, and metal siding that serves as a quiet backdrop for the owners' eclectic art collection. With cost and environment in mind, existing windows and doors were reused and solar panels installed.Photography: Bruce Damonte